US3953337A - Method of drilling wells employing water base drilling fluids - Google Patents
Method of drilling wells employing water base drilling fluids Download PDFInfo
- Publication number
- US3953337A US3953337A US05/416,701 US41670173A US3953337A US 3953337 A US3953337 A US 3953337A US 41670173 A US41670173 A US 41670173A US 3953337 A US3953337 A US 3953337A
- Authority
- US
- United States
- Prior art keywords
- drilling fluid
- drilling
- molecular weight
- salt
- polyethylene glycol
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000005553 drilling Methods 0.000 title claims abstract description 38
- 239000012530 fluid Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title description 4
- 150000003839 salts Chemical class 0.000 claims abstract description 16
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 15
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 13
- 239000004927 clay Substances 0.000 claims description 9
- 239000013505 freshwater Substances 0.000 claims description 6
- 239000002270 dispersing agent Substances 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 4
- 150000008044 alkali metal hydroxides Chemical class 0.000 claims description 3
- 230000001771 impaired effect Effects 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims 3
- 239000000203 mixture Substances 0.000 abstract description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 16
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 8
- 239000002585 base Substances 0.000 description 5
- 150000002334 glycols Chemical class 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 229920001732 Lignosulfonate Polymers 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 239000003518 caustics Substances 0.000 description 2
- 229940068918 polyethylene glycol 400 Drugs 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 229910000604 Ferrochrome Inorganic materials 0.000 description 1
- -1 Polyethylene Polymers 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/22—Synthetic organic compounds
Definitions
- the present invention relates to a method of and composition for the treatment of an aqueous drilling fluid. More particularly, the present invention is directed to a method of and composition for restoring the rheological properties of a fresh water drilling fluid that has become contaminated with salt using a prescribed amount of polyethylene glycol, hereinafter more fully defined.
- U.S. Pat. No. 3,525,688 discloses a water base drilling fluid containing sufficient clay to form a filter cake on the wall of the borehole and from 1 to 15 pounds of a polyethylene glycol having a molecular weight range of from 9,000 to 200,000 to reduce the water loss of the drilling fluid without increasing the viscosity of the drilling fluid to the extent it cannot be circulated.
- the present invention can be briefly described as a method of and composition for use in drilling wells comprising an aqueous drilling fluid consisting essentially of an aqueous solution containing clay solids dispersed therein by a clay dispersing agent, sufficient alkali metal hydroxide or oxide to provide a pH of at least 9.0 to the drilling fluid, a contaminating amount of salt in said aqueous drilling fluid whereby the drilling fluid rheological properties are substantially impaired and a minor amount of polyethylene glycol having a molecular weight range of about 300-500, whereby the rheological properties are substantially restored.
- the method comprises incorporating the specific glycol additive as hereinafter defined, into the salt contaminated drilling fluid in an amount ranging from 0.5 to 10.0 pounds thereof per barrel of drilling fluid, whereby the drilling fluid properties of viscosity and gel strength are substantially restored.
- glycol additives of this invention are effective in restoring the impaired rheological properties of a salt contaminated low pH fresh water drilling fluid since other glycols such as the higher molecular weight polyethylene glycols are not as effective.
- the glycols useful in the present invention are the polyethylene glycols of from 200 to 500 molecular weight, and particularly those in the weight range of 300-400 molecular weight.
- the polyethylene glycol of prescribed molecular weight be added to the salt contaminated low pH aqueous drilling fluid in order to attain the desired restoration of rheological properties. Addition of the polyethylene glycol to a low pH fresh water drilling fluid prior to the drilling fluid coming into contact with contaminating amounts of salt will result in little or no improvement in restoring the rheological properties to the drilling fluid.
- the drilling fluid used in the method of the invention is a low pH fresh water drilling fluid containing clay solids dispersed therein by a clay dispersing agent, such as lignosulfonate dispersant and sufficient caustic to maintain the pH thereof above about 9.0.
- a clay dispersing agent such as lignosulfonate dispersant and sufficient caustic to maintain the pH thereof above about 9.0.
- a fresh water drilling fluid containing clay solids dispersed therein by a ferrochrome lignosulfonate dispersant sold under the trade name "Q-Broxin", which is present in an amount of 6 pounds per barrel, and sufficient caustic to provide a pH of at least 9.0 to the drilling fluid was used as the base mud.
- This mud was contaminated with salt and then treated with various molecular weight glycols.
- the drilling fluid containing the salt and glycol was aged for four hours at 150° F. before determining the rheological properties. Determination of the base mud properties was made after a similar aging treatment.
- the rheological properties are set forth in the following table:
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- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Lubricants (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Method of and composition for the treatment of an aqueous drilling fluid containing contaminating amounts of salt whereby the rheological properties of the aqueous fluid are improved by treatment with a polyethylene glycol in the molecular weight range of from about 200 to 500.
Description
The present invention relates to a method of and composition for the treatment of an aqueous drilling fluid. More particularly, the present invention is directed to a method of and composition for restoring the rheological properties of a fresh water drilling fluid that has become contaminated with salt using a prescribed amount of polyethylene glycol, hereinafter more fully defined.
It is known from U.S. Pat. No. 2,589,949 that the viscosity of an aqueous drilling fluid containing clay can be reduced using as the viscosity control agent a polyethylene glycol having a molecular weight of from 150-8000 in an amount of from about 0.1 to about 10% by weight, based on the drilling fluid weight.
From U.S. Pat. No. 2,786,027 it is known to use from 0.5 to 5 pounds of a polyethylene glycol or a polypropylene glycol, of a molecular weight range of between about 90 and 3,000 in an aqueous drilling fluid containing finely divided solid material such as clay suspended therein, and 2-15% by weight of salt, 1-15 pounds of starch and not more than about 1 pound of alkali metal hydroxide per barrel, to control the water loss properties of the system.
U.S. Pat. No. 3,525,688 discloses a water base drilling fluid containing sufficient clay to form a filter cake on the wall of the borehole and from 1 to 15 pounds of a polyethylene glycol having a molecular weight range of from 9,000 to 200,000 to reduce the water loss of the drilling fluid without increasing the viscosity of the drilling fluid to the extent it cannot be circulated.
The present invention can be briefly described as a method of and composition for use in drilling wells comprising an aqueous drilling fluid consisting essentially of an aqueous solution containing clay solids dispersed therein by a clay dispersing agent, sufficient alkali metal hydroxide or oxide to provide a pH of at least 9.0 to the drilling fluid, a contaminating amount of salt in said aqueous drilling fluid whereby the drilling fluid rheological properties are substantially impaired and a minor amount of polyethylene glycol having a molecular weight range of about 300-500, whereby the rheological properties are substantially restored.
The method comprises incorporating the specific glycol additive as hereinafter defined, into the salt contaminated drilling fluid in an amount ranging from 0.5 to 10.0 pounds thereof per barrel of drilling fluid, whereby the drilling fluid properties of viscosity and gel strength are substantially restored.
It is surprising that the particular glycol additives of this invention are effective in restoring the impaired rheological properties of a salt contaminated low pH fresh water drilling fluid since other glycols such as the higher molecular weight polyethylene glycols are not as effective. The glycols useful in the present invention are the polyethylene glycols of from 200 to 500 molecular weight, and particularly those in the weight range of 300-400 molecular weight.
In carrying out the method of the present invention it is necessary that the polyethylene glycol of prescribed molecular weight be added to the salt contaminated low pH aqueous drilling fluid in order to attain the desired restoration of rheological properties. Addition of the polyethylene glycol to a low pH fresh water drilling fluid prior to the drilling fluid coming into contact with contaminating amounts of salt will result in little or no improvement in restoring the rheological properties to the drilling fluid.
The drilling fluid used in the method of the invention is a low pH fresh water drilling fluid containing clay solids dispersed therein by a clay dispersing agent, such as lignosulfonate dispersant and sufficient caustic to maintain the pH thereof above about 9.0.
Following is a description by way of example of the method of carrying out the present invention.
A fresh water drilling fluid containing clay solids dispersed therein by a ferrochrome lignosulfonate dispersant sold under the trade name "Q-Broxin", which is present in an amount of 6 pounds per barrel, and sufficient caustic to provide a pH of at least 9.0 to the drilling fluid was used as the base mud. This mud was contaminated with salt and then treated with various molecular weight glycols. The drilling fluid containing the salt and glycol was aged for four hours at 150° F. before determining the rheological properties. Determination of the base mud properties was made after a similar aging treatment. The rheological properties are set forth in the following table:
TABLE A
__________________________________________________________________________
Amount of Polyethylene
YP
Amount of NaCl
Glycol, lbs/bbl
PV lbs/ AV
Example
lbs/bbl (Molecular Weight)
cp.
100 ft..sup.2
cp.
__________________________________________________________________________
Base Mud A
0 0 34 9 39.5
" 20 0 37 128 101
1 20 10-Glycol (200)
39 32 55
2 20 10-Glycol (300)
41 24 53
3 20 10-Glycol (400)
40 17 48.5
4 20 10-Glycol (600)
61 36 79
5 20 10-Glycol (1,000)
55 60 85
__________________________________________________________________________
From the data in the above Table A it is evident that the polyethylene glycol (600) and polyethylene glycol (1,000) are not as effective in restoring the mud properties as the lower molecular weight glycols 200, 300 and 400, since the Yield Point and Apparent Viscosity values obtained therewith are not as low as the corresponding values obtained using the lower molecular weight glycols, (i.e. 200-400).
The following Table B illustrates that the order of addition of the glycol is important.
TABLE B
__________________________________________________________________________
Amount of Poly-
Ethylene Glycol,
YP
Amount of NaCl
lbs/bbl PV lbs/ AV
Example
lbs/bbl (Molecular Weight)
cp. 100 ft.sup.2
cp.
__________________________________________________________________________
Base Mud
-- -- 24 0 24
6* 7.5 4 - (400) 34.5 7.5 38.3
7* 10 4 - (400) 32.5 8.5 36.8
8* 15 4 - (400) 24 26 37
6A** 7.5 4 - (400) 27 10 37
7A** 10 4 - (400) 36.5 18.5 45
8A** 15 4 - (400) 25.5 41 46
__________________________________________________________________________
*Salt first, then glycol.
**Glycol first, then salt.
In the foregoing Table B the substantial differences between the relatively low Yield Point Values and Apparent Viscosity Values obtained when the polyethylene glycol 400 is added subsequent to the salt (Examples 6-8) in accordance with the method of the invention and the higher values shown for Examples 6A-8A wherein the glycol was added before the salt, illustrate the criticality of the order of addition of the polyethylene glycol 400 to the drilling mud, at varying concentrations of salt.
Obviously, many modifications and variations of the invention as hereinbefore set forth may be made without departing from the spirit and scope thereof and, therefore, only such limitations should be imposed as are indicated in the appended claims.
Claims (2)
1. In a method of drilling wells wherein a drilling fluid is passed through the well into contact with the earth formation during the drilling operation, the improvement which comprises contacting said earth formation with a low pH fresh water drilling fluid consisting essentially of clay solids dispersed therein by a clay-dispersing agent and sufficient alkali metal hydroxide to provide a pH of from about 9 to about 9.5 thereto, and wherein when said drilling fluid comes in contact with a sufficient amount of salt in said formation whereby its rheological properties are substantially impaired there is added to said drilling fluid a polyethylene glycol having an average molecular weight of from about 200 to about 500 in an amount of from about 0.5 to about 10 pounds per barrel of drilling fluid to restore the rheological properties of said drilling fluid.
2. The method of claim 1 wherein said polyethylene glycol has an average molecular weight range of from about 300 to 400.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/416,701 US3953337A (en) | 1973-11-16 | 1973-11-16 | Method of drilling wells employing water base drilling fluids |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/416,701 US3953337A (en) | 1973-11-16 | 1973-11-16 | Method of drilling wells employing water base drilling fluids |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3953337A true US3953337A (en) | 1976-04-27 |
Family
ID=23650963
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US05/416,701 Expired - Lifetime US3953337A (en) | 1973-11-16 | 1973-11-16 | Method of drilling wells employing water base drilling fluids |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US3953337A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4561985A (en) * | 1982-06-28 | 1985-12-31 | Union Carbide Corporation | Hec-bentonite compatible blends |
| EP0293191A2 (en) * | 1987-05-26 | 1988-11-30 | Hydra Fluids, Inc. | Drilling and completion fluid |
| US5919738A (en) * | 1997-01-24 | 1999-07-06 | Baker Hughes Incorporated | Fluids for use in drilling and completion operations comprising water insoluble colloidal complexes for improved rheology and filtration control |
| US6291405B1 (en) * | 1995-09-11 | 2001-09-18 | M-I Llc | Glycol based drilling fluid |
| US20040214726A1 (en) * | 2003-04-28 | 2004-10-28 | Robin Tudor | Well stimulation fluid and well stimulation fluid recycling process |
| WO2018144354A1 (en) * | 2017-02-03 | 2018-08-09 | Saudi Arabian Oil Company | Anti-bit balling drilling fluids, and methods of making and use thereof |
| US10640694B2 (en) | 2017-02-03 | 2020-05-05 | Saudi Arabian Oil Company | Compositions and methods of making of shale inhibition fluids |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2589949A (en) * | 1949-12-15 | 1952-03-18 | Standard Oil Dev Co | Controlling drilling fluid viscosity |
| US2786027A (en) * | 1955-09-16 | 1957-03-19 | Exxon Research Engineering Co | Modified starch containing drilling muds having a reduced filtration rate |
-
1973
- 1973-11-16 US US05/416,701 patent/US3953337A/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2589949A (en) * | 1949-12-15 | 1952-03-18 | Standard Oil Dev Co | Controlling drilling fluid viscosity |
| US2786027A (en) * | 1955-09-16 | 1957-03-19 | Exxon Research Engineering Co | Modified starch containing drilling muds having a reduced filtration rate |
Non-Patent Citations (1)
| Title |
|---|
| Rogers, Composition and Properties of Oil Well Drilling Fluids, Second Edition, Pub. 1953, pp. 310 and 334-338. * |
Cited By (42)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4561985A (en) * | 1982-06-28 | 1985-12-31 | Union Carbide Corporation | Hec-bentonite compatible blends |
| EP0293191A2 (en) * | 1987-05-26 | 1988-11-30 | Hydra Fluids, Inc. | Drilling and completion fluid |
| EP0293191A3 (en) * | 1987-05-26 | 1990-01-24 | Hydra Fluids, Inc. | Drilling and completion fluid |
| US6291405B1 (en) * | 1995-09-11 | 2001-09-18 | M-I Llc | Glycol based drilling fluid |
| US5919738A (en) * | 1997-01-24 | 1999-07-06 | Baker Hughes Incorporated | Fluids for use in drilling and completion operations comprising water insoluble colloidal complexes for improved rheology and filtration control |
| US20040214726A1 (en) * | 2003-04-28 | 2004-10-28 | Robin Tudor | Well stimulation fluid and well stimulation fluid recycling process |
| US10590325B2 (en) | 2017-02-03 | 2020-03-17 | Saudi Arabian Oil Company | Spacer fluid compositions that include surfactants |
| US10662363B2 (en) | 2017-02-03 | 2020-05-26 | Saudi Arabian Oil Company | Lubricants for water-based drilling fluids |
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| US10526520B2 (en) | 2017-02-03 | 2020-01-07 | Saudi Arabian Oil Company | Anti-bit balling drilling fluids, and methods of making and use thereof |
| US10538692B2 (en) | 2017-02-03 | 2020-01-21 | Saudi Arabian Oil Company | Development of anti-bit balling fluids |
| US10563110B2 (en) | 2017-02-03 | 2020-02-18 | Saudi Arabian Oil Company | Methods of using drilling fluid compositions with enhanced rheology |
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| WO2018144354A1 (en) * | 2017-02-03 | 2018-08-09 | Saudi Arabian Oil Company | Anti-bit balling drilling fluids, and methods of making and use thereof |
| US10640694B2 (en) | 2017-02-03 | 2020-05-05 | Saudi Arabian Oil Company | Compositions and methods of making of shale inhibition fluids |
| US10640695B2 (en) | 2017-02-03 | 2020-05-05 | Saudi Arabian Oil Company | Dispersant in cement formulations for oil and gas wells |
| US10266745B2 (en) | 2017-02-03 | 2019-04-23 | Saudi Arabian Oil Company | Anti-bit balling drilling fluids, and methods of making and use thereof |
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| US10851281B2 (en) | 2017-02-03 | 2020-12-01 | Saudi Arabian Oil Company | Development of anti-bit balling fluids |
| US10876028B2 (en) | 2017-02-03 | 2020-12-29 | Saudi Arabian Oil Company | Enhanced filtration control packages, wellbore servicing fluids utilizing the same, and methods of maintaining the structure of a wellbore |
| US10961426B2 (en) | 2017-02-03 | 2021-03-30 | Saudi Arabian Oil Company | Development of anti-bit balling fluids |
| US11015104B2 (en) | 2017-02-03 | 2021-05-25 | Saudi Arabian Oil Company | Cement slurries, cured cements and methods of making and use thereof |
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| US11078397B2 (en) | 2017-02-03 | 2021-08-03 | Saudi Arabian Oil Company | Spacer fluid compositions, methods, and systems for aqueous based drilling mud removal |
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